And you will NEVER have a turbo last more than a few hundred miles. If you're going to use an anti- lag setup like rally cars, you vent the BOV air into the exhaust upstream of the turbo. Either way, expect to replace turbos with every tank of gas.

Originally posted by NoJokE@Apr 23 2004, 03:30 PM Tonyd, yes your kit DID have a wastegate. The wastegate is on the manifold, without it your turbo would keep boosting until x amount of psi and eventually blow your motor.

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now that i think of it...

yes, yes it did. lol. im used to seeing the other type of wastegates that DIY turbo kits use.....

there are internal wastegates that are built into the turbo and extrenal wastegates that are attached between the head and the turbo housing...

the blow off valve makes the ppppssssstttttt
and the wastegate can make noise as well
some wastegates dump into the exhaust at the same place as the turbo outlet, some dump into the exhaust but like 18 inches down stream, and others dump intot he atmosphere

the last one makes noise...
you'll hear a pppsssstttttt and a louder pppsssstttt straight pipe exhaust type sound when these cars shift...

big difference- at low boost levels an internal wastegate will work just fine- it's found on most greddy kits and a few others- however internal wastegates may lead to boost creep at higher boost levels (boost creep is when the wastegate is overwhelmed by boost pressure and reacts too slow, causing a few scary moments where boost is higher than it should be)- THis is where the external gate is used, and in my experience, an open external wastegate dumping straight into the atmosphere does not make the same sound as a blow off valve, it's louder, raspier and less glamorous, unless you know what that sounds means

Originally posted by Slammed90Lude@Apr 23 2004, 06:52 PM big difference- at low boost levels an internal wastegate will work just fine- it's found on most greddy kits and a few others- however internal wastegates may lead to boost creep at higher boost levels (boost creep is when the wastegate is overwhelmed by boost pressure and reacts too slow, causing a few scary moments where boost is higher than it should be)- THis is where the external gate is used, and in my experience, an open external wastegate dumping straight into the atmosphere does not make the same sound as a blow off valve, it's louder, raspier and less glamorous, unless you know what that sounds means

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So i only need one of the two? or the wastegate and the BOV is needed in a turbo setup?

If i need the two, the both release the extra into the atmosphere, so both of them make a "sound" so i don't see why i have a choice??

ok a wastegates regulates boost, when your turbine is spinning it reaches XX amount of boost when it does that, a little flapper door inside of your turbo opens up and releases that excess boost into the atmosphere or back into the turbo (however you have it setup). IF you have no wastegate, then the turbine will build as much boost as it wants... now a BOV protects your turbo from back pressure in the intake piping due to sudden downspool or release of the throttle. the BOV is closed when boost is on because there is no vacuum. but when you let off the gas and vacumm builds... the BOV opens and the excess air is pushed out resulting in a PSHHHHH... so you NEED both of them, unless you are the people from exvitermini.com and your quote is "wastegates are for pussys"

Every turboed car has a wastegate, but not all have bovs. A lot of oldschool factory turbocharged cars did not come with bovs, mostly because they were not really running high enough boost pressures to necessitate a bov. My 84 turbo tbird did not have a bov. I don't remember it even having an intercooler. It only made like 123 hp stock out of the 2.3l I4.

wastegate = controls/bleeds excess exhaust gasses BEFORE going into the turbine to keep from overboosting/keep a steady psi.

BOV = bleeds excess gas to the atmosphere AFTER the turbo, before the TB, when the throttle body is closed. when closed, the boosted air from the turbo up has no where to go, hits the closed TB wall, and goes back down the charge pipe, thus, causing the turbo to want to spin backwards. this is bad.
this is what bov's prevent. they bleed that air, so as to protect your turbo.